Vintzileos A M, Knuppel R A
University of Medicine and Dentistry of New Jersey, Department of Obstetrics/Gynecology and Reproductive Sciences, Robert Wood Johnson Medical School, St. Peter's Medical Center, New Brunswick 08903-0591, USA.
Clin Obstet Gynecol. 1995 Mar;38(1):45-58. doi: 10.1097/00003081-199503000-00007.